1 Area of Preventive Medicine and Public Health, Universidad de Santiago de Compostela, Spain.
2 Area of Preventive Medicine and Public Health, Universidad de Santiago de Compostela, Spain; CIBER de Epidemiología y Salud Pública, CIBERESP, Spain; Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain. Electronic address: alberto.ruano@usc.es.
3 Area of Preventive Medicine and Public Health, Universidad de Santiago de Compostela, Spain; CIBER de Epidemiología y Salud Pública, CIBERESP, Spain; Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain.